Improvement in hydraulic lifts



J. CANAN.

HYDRAULIC LIFT.

N. -177,37z. Patented May 16,1876.

wrmc'ssas' STATEs PATENT OFFIon I JAMES OANAN, OF PORT OOIlBORN-E, ASSIGNOR OF ONE-HALF HIS RIGHT TO J OHN BUBROW, WALTER GHATFIELD, ALBERT OHATFIELD, OF

sir. OATHARINES, oANADA.

IMPROVEMENT IN HYDRAULIC LIFTS,

Specification forming'partrof LetterstPatent No. 177,372, dated May 16, 1876; application filed April 13, 1676.

dredges by hydraulic power. To the frame-work of each dredge, adjacent to each anchor, a vertically-placed metallic cylinder is connected by suitably-arranged pipes to a pump common to all the said cylinders, and so arranged that the power produced by the action of the said pump may be conveyed simultaneously to all the cylinders, or, if required, to only one of them. Within each of these cylinders is fitted a plunger rod, having keyed or otherwise fastened to it, immediately above the top of the cylinder, a block designed to hold an arm, which is attached by a strap to the anchorin such amanner that upon the upward motion of the plunger referred it gripes and carries with it the anchor, but releases it on the downward motion thereof. Each cylinder is also provided with an overflow-pipe for letting the Water escape when the plunger has been forced to the desired height, and each is also fitted with a safety-valve, which is set so as to relieve the cylinder should the pressure at any time become greater than is desired.

Figure. I, longitudinal section of dredge, exhibiting the mechanism for raising the stormanchor, Fig. II, detail plan of arm Fig. III, end view of dredge. 1

A is the frame of the dredge; B, the anchor;

.O, the metallic cylinder; D, the pipe to Which as may be desired. E is a plunger-rod, which fits into the cylinder 0, as shown. F is a block or pin fastened to the rod and supporting the arm 0, as shown. H is a strap tittin g over the anchor B, and held to -the arm 0 by the pin q. The description of connection and rounded form of the arm are such that the centric J is caused to join the anchor within the frame, and thus arrest the anchor in its descent. L is an overflow-pipe.

Having now described the general construction of my invention, I shall proceed to explain its operation. In the first place I may mention that spoon-dredges have usually three anchors, one on each side and one at the end. In the drawing the storm-anchor only is shown the mechanism being the same in each application, no further illustration is necessary.

Having constructed and placed in position the metallic cylinder 0, with the attachments as described, I attach hydraulic piping to the pipe D, connecting the said piping to a conveniently-located pump, by which water is forced through the piping referred to into the metallic cylinder (3, thereby forcing the plunger-rodEupward, and, owing to the connection described between each rod and its respective anchor, a corresponding motion is conveyed to them. As it would not be desirable to make the cylinder 0 sufiiciently long to enable the I anchors to be withdrawn in'one stroke of the plungers, each cylinder is provided with a draw-off cock, M, through which, when the supply from the pump is stopped, the water in the cylinders is withdrawn, and the plungerrod, by its own weight, descends to the bottom of the cylinder, and the operation as before can be repeated.

In my description of the construction it will be remembered that the connection between the plunger-rod E and the anchors B is such that, although in ascending the two must move :ogether, when the former commences todeicend, the connection is broken, and the two would descend independently of each other were it not that the descent of the anchor is irrested by the action of the eccentric rollers l, as before described; consequently the plunger-rods E return alone, and when the pressure s put on again the connection is once more affected, and the anchors carried still farther 1p, and so on till the anchors have been raised to the height desired. The plunger- 'od E may he stayed, if necessary, above 0 prevent it springing. Instead of water, :ompressed air, steam, or other similar power night be utilized for the purpose of raising he plunger E.

I do not claim, broadly, the application of hydraulic power for the purpose of raising weight; but

What I claim as my invention is-- A vertical metallic cylinder, 0, connected by suitably-arranged piping to a force-pump,

or its equivalent, and provided with a plunger, E, having a block or pin, F, by whichis held the lifting-arm G, in combination with the strap H and anchor B, arranged and operated substantially as and for the purpose specified.

JAMES OANAN.

Witnesses:

DURAN O. RIDOUT, GEO. A. AIRD. 

